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Developing an Analytical Model for the Temperature Dependence of Thermal Expansion Coefficient
Abstract:
Since the thermal expansion affects seriously the thermodynamic properties of the materials, a firm understanding and description of the thermal expansion phenomena are of primordial importance in any field of materials science. In the present study, an analytical model for the thermal expansion coefficient is developed based on a parametrized form of the interatomic potential and a modified Debye model for the distribution of atomic oscillations. In the model, it is hypothesized that the effect of anharmonicity can be incorporated through a variation of the Debye temperature. The deduced analytical expression indicates that the thermal expansion coefficient consists of a Debye-like component plus additional terms. The functional form of the derived expressions seems to grasp the gross trend of experimental observations. In view of this character, the derived analytical expression is promising, because it could be applied and extended to analyze the thermal expansion coefficient of different materials.
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131-136
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July 2026
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© 2026 Trans Tech Publications Ltd. All Rights Reserved
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